The surname Mannix is of Irish origin, derived from the Gaelic name Ó Mainchin, which translates to "monk. " This name was likely given to individuals who were associated with monasteries or had a connection to the clergy. Over time, the spelling of the name has varied, including forms like Manahan and Manihan. The use of the surname Mannix has seen significant changes, particularly with the introduction of surnames in the 18th century to facilitate taxation and record-keeping. Today, Mannix is a rare surname found predominantly in Ireland and the United States.
